- Reinout van Rees (Nelen & Schuurmans) is the original author. He's still maintaining it, together with Maurits.
- Maurits van Rees (Zest Software) added a heapload of improvements and is the maintainer, together with Reinout.
- Kevin Teague (Canada's Michael Smith Genome Sciences Center) added support for multiple version control systems, most notable Mercurial.
- Wouter vanden Hove (University of Gent) added support for uploading to multiple servers, using collective.dist.
- Godefroid Chapelle (BubbleNet) added /tag besides /tags for subversion.
- Richard Mitchell (Isotoma) added Python 3 support.
- Mateusz Legięcki added a dockerfile for much easier testing.
- Eli Sallé added pyproject.toml support for zest.releaser's own options. We're modern now!